Why are the input table weight readings fluctuating on my HI 1746WS?

Why are the weight readings in the Input Table fluctuating and not corresponding to the actual weight on the scale on my HI 1746WS module?

There are several reasons why your weight readings could be unstable in the HI 1746WS module. This could range from noise on the load cell line, to a bad unit or load cell.

If you do not have any damage to any components that would cause the fluctuation, and the settings in the module are adequate for the amount of vibration you may have on your system, then it would normally be a setting in the module affecting the format of the weight data.

Possible causes could be:

1. The calibration may not be correct. Make sure the module is properly calibrated.

2. The multiplier setting may not be correct, causing the numbers in the input table to be in the wrong format to be read directly. Check to see if there is a multiplier set into word 15 of the Output table. If there is not a multiplier (word 15 = 0) then the value being returned in the Input table is a 32 bit floating point type and cannot be read in the integer type format of the input table. This value must be copied from the integer registers of the input table to a floating point register or change the multiplier to receive data in integer format. To insert into floating point location to read/use do a copy command from Input table to a floating point register (source = MSW of reading, length of 1).

3. If there is a multiplier already, ensure the multiplier is not too large. You should have a maximum of 1000 for the multiplier (3 decimal places). Decimal places would depend on capacity of scale. Resolution should be limited to about 1/10,000 of total scale capacity. Any more than this may cause fluctuation on the lower decimal places.

4. If the multiplier is not a power of 10, (10, 100, 1000) then the number may not be recognizable. If this is the case, verify the value being read is divided by the multiplier and the multiplier is not too large causing resolution higher than the load cell can get. This could cause rapid fluctuation in the reading.